Image processing method, image display method, image processing device, image display device, image processing program, and image display program

Abstract

A non perfusion area is detected from a fundus image. A fundus image is acquired, a first non perfusion area in a first region of the fundus is extracted from the fundus image, and a second non perfusion area in a second region of the fundus is extracted from the fundus image.

The invention claimed is: 
     
       1. An image processing method comprising:
 acquiring a fundus image; 
 extracting a first non perfusion area, by performing a first image processing in a first region of a fundus posterior pole portion, from the fundus image; and 
 extracting a second non perfusion area, by performing a second image processing, which is different from the first image processing, in a second region, which is a peripheral region of the fundus posterior pole portion, from the fundus image, 
 wherein, in the extracting of the second non perfusion area, a region that is a predetermined distance or more away from blood vessels on a fundus extracted from the fundus image is extracted as the second non perfusion area. 
 
     
     
       2. The image processing method of  claim 1 , further comprising:
 extracting a third non perfusion area likely to have been misdetected among extracted first non perfusion areas; and 
 excluding the third non perfusion area from the extracted first non perfusion areas. 
 
     
     
       3. The image processing method of  claim 1 , wherein the fundus image is a fluoroscopic fundus image or an OCT image acquired by optical coherence tomography. 
     
     
       4. A non-transitory computer readable storage medium storing an image processing program executable by a computer to perform the image processing method of  claim 1 . 
     
     
       5. The image processing method of  claim 1  wherein
 in the extracting of the first non perfusion area, a region along the blood vessels on the fundus extracted from the fundus image and a region equal to or below a predetermined threshold is extracted as the first non perfusion area. 
 
     
     
       6. The image processing method of  claim 5 , wherein
 in the extracting of the first non perfusion area, an average value of pixel values determined from at least one of brightness, saturation, or hue of a plurality of first non perfusion areas extracted from the fundus image is set as the threshold. 
 
     
     
       7. An image processing device comprising:
 a fundus image acquisition section, of a processor, configured to acquire a fundus image; 
 a first non perfusion area extraction section, of the processor, configured to extract, a first non perfusion area, by performing a first image processing in a first region of a fundus posterior pole portion, from the fundus image; and 
 a second non perfusion area extraction section, of the processor, configured to extract, a second non perfusion area, by performing a second image processing, which is different from the first image processing, in a second region, which is a peripheral region of the fundus posterior pole portion, from the fundus image, 
 wherein the second non perfusion area extraction section extracts a region that is a predetermined distance or more away from blood vessels on a fundus extracted from the fundus image, as the second non perfusion area.